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Knock Sensor/evap Purge Valve


redright9

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A friend of mine at work has a 2003 Silverado 2wd with the 5.3l engine. It had codes for knock sensor faults and evap purge valve. Both were replaced. Now the codes have come back and the repair place cannot find faults and says try the dealer. Also, it has a rough start sometimes in the morning.. Think a fuel pump issue may be happening?

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